https://doi.org/10.1140/epjc/s10052-023-11712-7
Regular Article - Theoretical Physics
More on the first-order thermodynamics of scalar-tensor and Horndeski gravity
Department of Physics and Astronomy, Bishop’s University, 2600 College Street, J1M 1Z7, Sherbrooke, QC, Canada
Received:
10
February
2023
Accepted:
11
June
2023
Published online:
20
June
2023
Two issues in the first-order thermodynamics of scalar-tensor (including “viable” Horndeski) gravity are elucidated. The application of this new formalism to FLRW cosmology is shown to be fully legitimate and then extended to all Bianchi universes. It is shown that the formalism holds thanks to the almost miraculous fact that the constitutive relations of Eckart’s thermodynamics are satisfied, while writing the field equations as effective Einstein equations with an effective dissipative fluid does not contain new physics.
© The Author(s) 2023
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